Maintenance Data -Inaccuracies, Ambiguities

       It is recognised that some maintenance manuals provided by the manufacturers often offer scope for improvement.                                     Ideally, maintenance manuals should be validated when first written, for each new aircraft type and variant, but this is a task which is rarely carried out as thoroughly as it might be, if at all.                                                              Accordingly, it tends to be left to operational experience to pick up the inaccuracies, ambiguities or missing information in maintenance manuals.                           In addition, the information in the maintenance manual is not necessarily always in an appropriate form to be used in a maintenance environment, and some translation may be required to make this data more usable. 

         AMO must have in place a procedure whereby such inaccuracies, ambiguities or missing information are recorded and reported to the type certificate holder.                        Staff should be encouraged to report such problems, but it should be borne in mind that they will only continue to do so if they believe that the problems are being addressed. 

  TC holders and owners of MD should act upon reported defects, and update the manuals quickly. 

It is not clear as to whether this obligation would also apply to ambiguous data, or data which is difficult to use, although if a good argument can be made that such data is likely to "cause adverse effects on continuing airworthiness" then this data should also be fixed. Whether the TC holder can then levy a charge for such rectifications, is a matter for negotiation between the various organisations, and forward thinking on the part of the various contracts departments.            It is good human factors practice for manufacturers to ensure that maintenance manuals are correct, complete, unambiguous and ‘user friendly’, both from the outset and on a continuing basis. Data sharing will help build up a larger database of deficiencies, which in turn places more pressure on the TC holders to fix problems.

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